Oklahoma Tornado Monday May, 20 2013

A child is pulled from the rubble of the Plaza Towers Elementary School in Moore, Okla., and passed along to rescuers Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school.(AP Photo Sue Ogrocki)

THE ASSOCIATED PRESS2013

A woman carries her child through a field near the collapsed Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. A tornado as much as a mile (1.6 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

THE ASSOCIATED PRESS2013

A boy is pulled from beneath a collapsed wall at the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (1.6 kilometer) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on the elementary school. (AP Photo Sue Ogrocki)

Associated Press

Moore police dig through the rubble of the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Sue Ogrocki)

Associated Press

A boy is pulled from beneath a collapsed wall at the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/ Sue Ogrocki)

Associated Press

A child is passed along a human chain of people after being pulled from the rubble of the Plaza Towers Elementary School in Moore, Okla., and passed along a human chain of rescuers Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

Associated Press

A fire burns in the Tower Plaza Addition in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado as much as half a mile wide with winds up to 200 mph roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

Associated Press

Rescue workers dig through the rubble of a collapsed wall at the Plaza Tower Elementary School to free trapped students in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

Associated Press

Onlookers watch as children are pulled from the rubble of the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

Associated Press

A woman carries a child through a field near the collapsed Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile wide with winds up to 200 mph roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

Associated Press

A woman is pulled out from under tornado debris at the Plaza Towers School in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

Associated Press

This photo provided by KFOR-TV shows homes flattened outside Moore, Okla., Monday, May 20, 2013. A monstrous tornado as much as half a mile wide roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/KFOR-TV)

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This photo provided by KFOR-TV shows a house fire outside Moore, Okla., Monday, May 20, 2013. A monstrous tornado as much as half a mile wide roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/KFOR-TV)

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This photo provided by KFOR-TV shows a house fire outside Moore, Okla., Monday, May 20, 2013. A monstrous tornado as much as half a mile wide roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/KFOR-TV)

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A child is carried from the rubble of the Plaza Towers Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Sue Ogrocki)

FILE - In this Tuesday, May 4, 1999, photo, a neighborhood in Moore, Okla., lays in ruins pm Tuesday, May 4, 1999, after a tornado flattened many houses and buildings in central Oklahoma, Monday, night. The powerful tornado in suburban Oklahoma City Monday, May 20, 2013, loosely followed the path of a killer twister that slammed the region in May 1999. (AP Photo/J. Pat Carter, File)

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The steeple of a church at South Janeway Avenue and SW 4th Street lays across the lawn after a tornado moved through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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Rescuers recover a horse from the remains of a day care center and destroyed barns, Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney)

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Sydney Whittaker salvages items from Trends Salon on Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney)

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A tornado moves through Moore, Okla. as northbound traffic on Interstate 35 stops at Indian Hills Road on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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A woman carries an injured child to a triage center near the Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

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A child is pulled from beneath a collapsed wall at the Plaza Towers Elementary School in following a tornado in Moore, Okla., Monday, May 20, 2013. (AP Photo Sue Ogrocki)

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A tornado moves past homes in Moore, Okla. on Monday, May 20, 2013. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Alonzo Adams)

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A tornado moves past homes in Moore, Okla. on Monday, May 20, 2013. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Alonzo Adams)

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Allen Anderson surveys the damage to his home, Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney)

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A woman walks near a destroyed home, Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney)

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JoAnn Anderson sorts through the rubble of her home after a tornado on Monday, May 20, 2013 in Moore, Okla. A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Steve Sisney)

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Emergency workers pull out a woman that was trapped in a building that was destroyed off of 4th Street and Interstate 35 after a tornado ripped through Moore, Okla., Monday May 20, 2013. (AP Photo/ The Transcript,Kyle Phillips )

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Monday, May 20, 2013, in Near Ardmore, Oklahoma. (AP Photo/Tony GutierrezStorm clouds are shown moving East Monday, May 20, 2013, Near Ardmore, Oklahoma after a tornado moved the the Moore, Okla., area. . (AP Photo/Tony Gutierrez)

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Two men attempt to pry open a door on this car to check for victims in a business parking lot west of I-35 south of 4th Street in Moore, on Monday, May 20, 2013.A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Jim Beckel)

THE ASSOCIATED PRESS2013

Storm clouds are shown moving East Monday, May 20, 2013, Near Ardmore, Oklahoma after a tornado moved the the Moore, Okla., area. . (AP Photo/Tony Gutierrez)

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Two men attempt to pry open a door on this car to check for victims in a business parking lot west of I-35 south of 4th Street in Moore, on Monday, May 20, 2013.A monstrous tornado roared through the Oklahoma City suburbs, flattening entire neighborhoods with winds up to 200 mph, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/The Oklahoman, Jim Beckel)

THE ASSOCIATED PRESS2013

The Moore Medical Center and vehicles lay damaged after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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Glenn Rusk hugs his neighbor Sherie Loman outside her home north of Briarwood Elementary School after a tornado moved through the area, in Moore, Okla., Monday, May 20, 2013. (AP Photo/The Oklahoman, David McDaniel)

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A security officer marks vehicles with spray paint after checking for victims and determining no one is inside, at a business complex west of Interstate 35, south of 4th Street in Moore, Okla., on Monday, May 20, 2013. (AP Photo/The Oklahoman, Jim Beckel)

This aerial photo shows the Moore Medical center in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

THE ASSOCIATED PRESS2013

Rachel Hilton holds stray kittens she found in the debris of her parents' home at SW 149th and Stone Meadows Dr. after a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. (AP Photo/The Oklahoman, Nate Billings)

A woman carries a child through a field near the collapsed Plaza Towers Elementary School in Moore, Okla., Monday, May 20, 2013. The relationship between the woman and the child was not immediately known. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

THE ASSOCIATED PRESS2013

A man searches a damaged home near SW 4th Street and Telephone Road after a tornado moved through Moore, Okla., on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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A child calls to his father after being pulled from the rubble of the Tower Plaza Elementary School following a tornado in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo Sue Ogrocki)

THE ASSOCIATED PRESS2013

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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Damaged cars lay ruined at a business parking lot west of Interstate 35, south of 4th Street in Moore, Okla., on Monday, May 20, 2013. (AP Photo/The Oklahoman, Jim Beckel)

A woman is pulled out from under tornado debris at the Plaza Towers School in Moore, Okla., Monday, May 20, 2013. A tornado as much as half a mile (.8 kilometers) wide with winds up to 200 mph (320 kph) roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school.(AP Photo Sue Ogrocki)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

Workers walk past the rubble of Plaza Towers Elementary School after a tornado moved through Moore, Okla., Monday, May 20, 2013. (AP Photo Sue Ogrocki)

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Workers continue to dig through the rubble of Plaza Towers Elementary School after a tornado moved through Moore, Okla., Monday, May 20, 2013. (AP Photo Sue Ogrocki)

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A Moore Medical Center patient sits in the parking lot after a tornado damaged the hospital in Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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People search the debris near Telephone Road and SW 4th Street in Moore, Okla. after a tornado on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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Ambulances are parked at Plaza Towers Elementary School as workers continue to dig through the rubble after a tornado moved through Moore, Okla., Monday, May 20, 2013. (AP Photo/Sue Ogrocki)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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People react in front of the Towers Plaza Elementary school in Moore following a deadly tornado, Monday, May 20, 2013. Photo by Sarah Phipps, The Oklahoman

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Clark Gardner, at left, and another man place an American flag on debris in a neighborhood off of Telephone Road in Moore, Okla., after a tornado moved through the area on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Bryan Terry)

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Cindy Wilson texts to friends after her home was destroyed in the afternoon tornado. Cindy and her husband, Staff Sgt. B. Wilson, took cover in their home's bathtub when the tornado hit. Cindy received a deep gash to her forehead and her wound was treated by first responders at the scene. Tornado caused extensive damage in the Madison Place Addition, near SE 8 and Tower in Moore, on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Jim Beckel)

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A man and a woman assist a state trooper carry a large tarp to cover a tornado victim found in a field across the street from the Madison Place Addition, near SE 8 and Tower in Moore, on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Jim Beckel)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows damage to Plaza Towers Elementary School after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows damage to Plaza Towers Elementary School after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows damage to Plaza Towers Elementary School after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows damage to Moore Medical Center after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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Shawna Scott, second from left, tries to help Jeanett McAllister, second from right, and McAllister's son, Tonice Woods, find McAllister's two nieces, Sabrina and Olivia Durkey, who are students at Briarwood Elementary, after a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. At left is Feliciana Hernando, Scott's niece. Scott has a home daycare near SW 156th and Vicki and went to Briarwood to pick up one of the children she watches. She took a group of students from the destroyed school to her home to wait for their parents. (AP Photo/ The Oklahoman, Nate Billings)

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Rebekah Stuck hugs her son, Aiden Stuck, 7, after she found him in front of the destroyed Briarwood Elementary after a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. Aiden Stuck was inside the school when it was hit. (AP Photo/ The Oklahoman, Nate Billings)

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Mary Barnhill, left, sits next to her daughter-in-law Brenda Barnhill after a tornado destroyed the home of Brenda Barnhill and her husband Larry Barnhill, Mary's son, near SW 149th and Vicki Dr., when a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. (AP Photo/ The Oklahoman, Nate Billings)

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Briarwood Elementary P.E. teacher Mike Murphy comforts Aiden Stuck, 7, as he waits for his mother at the school after a tornado destroyed Briarwood Elementary and struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013.(AP Photo/ The Oklahoman, Nate Billings)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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People walk through a neighborhood south of SW 149th between Western and Hudson after a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. (AP Photo/ The Oklahoman, Nate Billings)

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Two men walk through debris just east of Western and north of SW 149th after a tornado struck south Oklahoma City and Moore, Okla., Monday, May 20, 2013. (AP Photo/ The Oklahoman, Nate Billings)

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This aerial photo shows damage to buildings hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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Two men stand in front of Plaza Towers Elementary School in Moore, Okla., after a tornado destroyed a tornado on Monday, May 20, 2013. (AP Photo/ The Oklahoman, Bryan Terry)

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This aerial photo shows the path of a massive tornado in Moore, Okla., Monday May 20, 2013. The tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows damage to buildings hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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This aerial photo shows damage to Plaza Towers Elementary School after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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A tornado victim is wheels to an ambulance at 147th and Hudson , Monday, May 20, 2013. (AP Photo/ The Oklahoman, David McDaniel)

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Searchers rest outside the Briarwood Elementary School after the tornado destroyed the school , Monday, May 20, 2013. (AP Photo/ The Oklahoman, David McDaniel)

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This aerial photo shows damage to Plaza Towers Elementary School after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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Emergency crews recover a body from the 7-11 store at the corner of Telephone Road and SW 4th Street after a tornado in Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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This aerial photo shows damage to Moore Medical Center after it was hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

THE ASSOCIATED PRESS2013

This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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Antonio Flores of Moore, Okla. searches for his car after a tornado damaged the Moore Medical Center and the vehicles in the parking lot in Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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Rescue workers dig through the rubble of a collapsed wall at the Plaza Tower Elementary School to free trapped students in Moore, Okla., following a tornado Monday, May 20, 2013. (AP Photo Sue Ogrocki)

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A man searches debris near Telephone Road and SW 4th after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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A couple after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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People go through the debris near Telephone Road and SW 4th Street after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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Debris lays on the northbound lanes of I-35 just south of SW 4th street in Moore, Okla. after a tornado moves through the area on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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A worker clears debris from the southbound lanes of I-35 in Moore, Okla. after a tornado moves through the area on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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A car in the parking lot of the Moore Medical Center is marked as a Biohazard after a massive tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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Two men go through the damage surrounding the Moore Medical Center and damaged vehicals after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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A truck lays damaged in a field near the Moore Medical Center, background, after a tornado moves through Moore, Okla. on Monday, May 20, 2013. (AP Photo/Alonzo Adams)

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This aerial photo shows the remains of homes hit by a massive tornado in Moore, Okla., Monday May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

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CORRECTS TORNADO MEASUREMENT TO NUMBER REPORTED BY THE NATIONAL WEATHER SERVICE - This photo provided by KFOR-TV shows a car pile-up outside Moore, Okla., Monday, May 20, 2013. A monstrous tornado as much as half a mile wide roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/KFOR-TV)

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This aerial photo shows the remains of houses in Moore, Okla., following a tornado Monday, May 20, 2013. A tornado roared through the Oklahoma City suburbs Monday, flattening entire neighborhoods, setting buildings on fire and landing a direct blow on an elementary school. (AP Photo/Steve Gooch)

THE ASSOCIATED PRESS2013

People react in front of the Plaza Towers Elementary school in Moore following a deadly tornado, Monday, May 20, 2013. (AP Photo/ The Oklahoman, Sarah Phipps)